Boost reference Demon Carb

[KNOT-RIGHT]

Remember the the original two tiny holes near the screw hole underneath the base plate. We must plug them now. They are both 3/32 in diamiter. I purchased
some 3/32 brass solid rod. from mcmaster-carr.com
and cut a 3/16 peace and applied some locktite to it and carefuly punched it into one of the holes. the second hole I chose to use a very small machine screw with a large head. I applied more locktite red to it and screwed
it into the other hole. the size was perfect as to make its own threads while screwing into the soft aluminum base plate. The large head insures the brass plug installed a minute ago is held in.
http://www.***boat.com/forums/attach...achmentid=5945

[KNOT-RIGHT]

it should look like this.
Notice the screw is actualy beneth the base plate.
http://www.***boat.com/forums/attach...achmentid=5946

[KNOT-RIGHT]

The finished project.
(Lines not plumbed into manifold yet.)
I did four carbs in 6 hours with a minimal amount of swearing and throwing wrenches.
total cost of project was 26.00 dollars
There are many who operate blowers without
boost reference. I figured for 26 bucks and 6 hours
why not.
Gerry,
Please feel free to call me if anyone has
any questions.
401-255-5242
http://www.***boat.com/forums/attach...achmentid=5947

[Infomaniac]

81 views so far and no compliments on the project?
Let me be the first to say: Great Job Man.
Mind If I spice it up a bit to make it a little more viewer friendly?

[Some Kind Of Monster]

Very nice job. Should there be a performance gain?

[KNOT-RIGHT]

Thanks For the Help Info!!
Some kind of Monster. Not sure If Performance is the word to use.
A brief description would be
The # on the Power valve is the measurement of the vacuum in "HG" meaning a 6.5 would open at 6.5 HG and remain open anything below 6.5. If you connect a vacuum gauge under the carb (normaly Asperated) and you read 12 HG of vacuum at idle a starting point would be 10.5. However Heavier boats and or different setups play a role. The Idea behind the power valve is it enrichens the carb circuit when the engine needs more fuel. Hence low vacuum (Load). Obtaining the correct
PV in a boat is a little different then the street. The Ideal situation would be
to have the power valve closed at minimal planing speed that way when
you give it throttle the vacuum would drop opening the power valve. Some
choose not to run power valves by installing plugs and upping the jet sizes
by 7-10. Please Remember to check plugs accordingly. Not to confuse you
anymore. Some Supercharge applications Boost reference the power valve.
meaning they block the signal from above the blower and reroute it beneath
the blower so the carb see's the engine vacuum not the Blower.
This is the above procedure.
Hope this helps
Gerry

[78Eliminator]

Now THAT is what this forum is all about. I bet you just made a lot of people a lot more confident to take on that kind of job. Thanks for the information. Just goes to show, you don't need to drop big cash for simple jobs.

[RiverDave]

Great Write up!!! To echo what 78 said, that's what the tech forums are all about!!
RD

[hack job]

great job! we need more inof like this iam sure glad that they put this forum up